jaapv Posted August 30, 2012 Share #21 Posted August 30, 2012 Advertisement (gone after registration) A non-noise reduced image would be completely useless. There is no way to do this kind of noise reduction in the computer, it is a totally different principle. So turning it off would be the same as not taking the image. As said a few times before in this thread. Link to post Share on other sites More sharing options...
Advertisement Posted August 30, 2012 Posted August 30, 2012 Hi jaapv, Take a look here Possibility to completly turn off Noise Reduction on Long Exposures?. I'm sure you'll find what you were looking for!
scottwyden Posted August 30, 2012 Share #22 Posted August 30, 2012 Of course, but we could still dream for it to be a faster process. Link to post Share on other sites More sharing options...
jaapv Posted August 30, 2012 Share #23 Posted August 30, 2012 Of course, but the second exposure must be exactly the same length as the first. Link to post Share on other sites More sharing options...
pico Posted August 30, 2012 Share #24 Posted August 30, 2012 I think this is one of the downsides to the M9. There is currently no way to do a lot of long exposures without killing a battery. Unless I missed something and there is a battery extension pack somewhere? No battery extension. It has been discussed here. If there had been adequate interest, then an entrepreneur would likely have offered such. There is a fast and convenient battery and SD change bottom available from Leicatime. Click on the left column under 'battery and sd changer'. (I plan to buy one to make working in sub-zero weather just a bit easier.) The essence of Leica M design and use philosophy does not include some things, however it is remarkable (to me) that Leica included dark frame subtraction. For making many exceptionally long exposures I would look to a specialty camera. Link to post Share on other sites More sharing options...
Mumi Xam Posted August 30, 2012 Share #25 Posted August 30, 2012 A non-noise reduced image would be completely useless. I'm just wondering, how is it possible to get perfectly clean file from Nikon D40 at 30 min. exposures with NR Off - I could provide samples. D40 has the same type of sensor. Link to post Share on other sites More sharing options...
pico Posted August 30, 2012 Share #26 Posted August 30, 2012 I'm just wondering, how is it possible to get perfectly clean file from Nikon D40 at 30 min. exposures with NR Off - I could provide samples. D40 has the same type of sensor. One approach is to have reference frames stored. For example, a 30-second dark frame to apply to any 30-second exposure. This approach is a compromise because dark noise depends upon environmental factors which would possibly change the hot pixels. Look to astronomy photography sites for a great deal of such information. . Link to post Share on other sites More sharing options...
jaapv Posted August 30, 2012 Share #27 Posted August 30, 2012 Advertisement (gone after registration) I'm just wondering, how is it possible to get perfectly clean file from Nikon D40 at 30 min. exposures with NR Off - I could provide samples. D40 has the same type of sensor. CMos is completely different, as noise is equalized at readout by the on-sensor noisereducing circuitry. Link to post Share on other sites More sharing options...
farnz Posted August 30, 2012 Share #28 Posted August 30, 2012 If you want to avoid the time taken to record the 'dark frame' that's used to remove the effect of hot pixels then you could simply switch the camera off and back on once it starts recording the dark frame. You'll end up with hot pixels in the picture but that may be acceptable to you in certain circumstances. This is the same technique I, I mean a friend of mine;), uses when he's taken a shot with his lens cap on and the camera sets the exposure to 32 seconds. The camera don't appear to mind at all. Pete. Link to post Share on other sites More sharing options...
Mumi Xam Posted August 30, 2012 Share #29 Posted August 30, 2012 CMos is completely different, as noise is equalized at readout by the on-sensor noisereducing circuitry. D40 has the same sensor type as M8 - CCD. Link to post Share on other sites More sharing options...
jaapv Posted August 30, 2012 Share #30 Posted August 30, 2012 Ok In that case , although basically true, disregard. Link to post Share on other sites More sharing options...
Mumi Xam Posted August 31, 2012 Share #31 Posted August 31, 2012 CMos is completely different, as noise is equalized at readout by the on-sensor noisereducing circuitry. Thanks, jaapv! But I even more puzzled now: my D700 (CMOS) produced a lot of more noise at very long exposures even with NR=On than D40 (CCD) with no noise reduction... Link to post Share on other sites More sharing options...
jaapv Posted August 31, 2012 Share #32 Posted August 31, 2012 I have no idea A question to ask in a Nikon forum perhaps. Link to post Share on other sites More sharing options...
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